chore: refactore minor

Author: anikethsaha

appveyor.yml

@@ -1,6 +1,6 @@
 environment:
   matrix:
-    - nodejs_version: "11"
+    - nodejs_version: "12"
     - nodejs_version: "11"
     - nodejs_version: "10"
     - nodejs_version: "9"

package.json

@@ -15,7 +15,7 @@
     "posthtml": "lib/cli.js"
   },
   "engines": {
-    "node": ">=10.13.0"
+    "node": ">=10"
   },
   "scripts": {
     "version": "conventional-changelog -i changelog.md -s -r 0 && git add changelog.md && git commit -m \"build: update changelog\"",

readme.md

@@ -12,6 +12,8 @@
 $ npm install --global posthtml-cli
 ```
 
+> Note: This project is compatible with node v10+
+
 ## Usage
 
 ```bash